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Low-Carb Blackberry Fool

4.5 stars, average of 61 ratings

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A fool is a simple English parfait made with puréed fruit and whipped cream. Although the original recipe is made with custard, most of the recipes you'll find these days skip the custard and simply use sweetened cream.

Just like the original dessert, my keto-friendly recipe requires just a few common ingredients. Berries are now in season so I used blackberries from the garden but any berries will work just fine. Feel free swap the blackberries with my Low-Carb Strawberry & Rhubarb Jam, Sugar-Free Raspberry Balsamic Chia Jam or one of my absolute favourites Low-Carb Cherry Amarenata.

And it's not just a summer treat. You can use my Low-Carb Mulled Wine Berry Jam and you've got the perfect keto treat for the Holiday season!

This keto dessert has been adapted from Jamie Oliver's recipe.

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Allergy information for Low-Carb Blackberry Fool

✔  Gluten free
✔  Egg free
✔  Nut free
✔  Nightshade free
✔  Pork free
✔  Avocado free
✔  Coconut free
✔  Fish free
✔  Shellfish free
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Nutritional values (per serving)

Net carbs7.8 grams
Protein3.5 grams
Fat38.2 grams
Calories405 kcal

Calories from carbs 8%, protein 4%, fat 88%

Total carbs11.9 gramsFiber4 gramsSugars7.6 gramsSaturated fat23.3 gramsSodium43 mg(2% RDA)Magnesium25 mg(6% RDA)Potassium235 mg(12% EMR)

Ingredients (6 servings)

  • 450 g blackberries, fresh or frozen (1 lb)
  • 2 tbsp lemon juice (30 ml)
  • 1/4 cup granulated Erythritol or Swerve (50 g/ 1.8 oz)
  • 1/2 tsp vanilla powder or 1-2 tsp sugar-free vanilla extract
  • 2 cups heavy whipping cream (480 ml/ 16 fl oz)
  • zest from 1 lemon
  • 1 cup sour cream (230 g/ 8.1 oz)
  • Optional: 20-30 drops liquid stevia
  • Optional: about 1 tbsp chia seeds to thicken

Note: for a dairy-free option, use coconut cream instead of heavy whipping cream, and coconut yogurt instead of sour cream. If you avoid sweeteners you can skip them altogether.


  1. Start by preparing the blackberry sauce. Juice and zest the lemon. Set the zest aside to use it later in the cream. Keep 6 blackberries aside for topping. Low-Carb Blackberry Fool
  2. Place the blackberries into a sauce pan. Add the erythritol, half of the vanilla powder and lemon juice.
  3. Bring to a boil and simmer for 3-5 minutes, or until the berries are soft. Set aside to cool down completely. To speed it up you can place the sauce pan into ice bath. Low-Carb Blackberry Fool
  4. Pour the heavy whipping cream in a large bowl and whisk to form peaks. Gently fold through the sour cream, fine lemon zest and the remaining vanilla powder.
  5. Swirl in about half of the cooled blackberry juice. Low-Carb Blackberry Fool
  6. Mix using a rubber spatula. Add a few drops of stevia if desired. Low-Carb Blackberry Fool
  7. To assemble, spoon a layer of the blackberry-lemon cream into 6 jars. Add a layer of the softened blackberries and blackberry juice. Repeat the process again and finally top with a fresh blackberry.
    Note: the blackberry mixture will be quite runny. If you prefer a more jam-like texture, add about a tablespoon of whole chia seeds and let it set for about 30 minutes. Low-Carb Blackberry Fool
  8. Place in the fridge for about 2 hours to set. Store refrigerated for up to 3 days. Low-Carb Blackberry Fool

Ingredient nutritional breakdown (per serving)

Net carbsProteinFatCalories
Blackberries, fresh
3.2 g1 g0.4 g32 kcal
Lemon juice, fresh
0.3 g0 g0 g1 kcal
Erythritol (natural low-carb sweetener)
0.4 g0 g0 g2 kcal
Vanilla extract, powder (vanilla bean)
0 g0 g0 g1 kcal
Cream, heavy whipping, pouring, full-fat (30-40% fat)
2.1 g1.5 g30.4 g293 kcal
Lemon zest (peel), fresh
0 g0 g0 g0 kcal
Cream, sour
1.8 g0.9 g7.4 g76 kcal
Total per serving
7.8 g3.5 g38.2 g405 kcal

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Martina Slajerova
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Martina Slajerova

I changed the way I ate in 2011, when I was diagnosed with Hashimoto’s, an autoimmune disease that affects the thyroid. I had no energy, and I found it more and more difficult to maintain a healthy weight.

That’s when I decided to quit sugar, grains, and processed foods, and to start following a whole-foods-based ketogenic approach to food.

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Comments (6)

I love love love that you always give dairy free options for your recipes! Being dairy sensitive means so many keto recipes are beyond my reach. Thank you for thinking of us deprived ones (I miss cheese😭)!


Thank you for your kind words, Suparna!


This is delicious! I halved the recipe and divided it into 4 servings but it still made a lot, so we've been sharing one between two 😊. I did add the optional Stevia to the cream but it'll be lovely even without. Thank you so much for such a simple, wonderful recipe!


Thank you Anu! These are indeed generous servings! 😊


Hi Martina,
I’m having trouble finding no added sugar vanilla. I noticed some of your recipes require vanilla, I’m wondering if it’d be acceptable to use organic vanilla pods instead?
Thank You and kindest regards.x


Hi Laura, vanilla pods are perfect! I often use vanilla powder which is made from the tiny seeds found in vanilla pods (It can be quite pricey though). If you can find sugar-free vanilla extract, it will likely be alcohol-based. I make my own: Homemade Sugar-Free Vanilla Extract